EP2814049A1 - Antriebsmechanismus für eine Schaltvorrichtung - Google Patents

Antriebsmechanismus für eine Schaltvorrichtung Download PDF

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Publication number
EP2814049A1
EP2814049A1 EP13171532.8A EP13171532A EP2814049A1 EP 2814049 A1 EP2814049 A1 EP 2814049A1 EP 13171532 A EP13171532 A EP 13171532A EP 2814049 A1 EP2814049 A1 EP 2814049A1
Authority
EP
European Patent Office
Prior art keywords
arcing
drive mechanism
switching device
arcing element
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13171532.8A
Other languages
English (en)
French (fr)
Inventor
Emmanouil Panousis
Bernhard Petermeier
Angelos Garyfallos
Markus Bujotzek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Technology AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to EP13171532.8A priority Critical patent/EP2814049A1/de
Publication of EP2814049A1 publication Critical patent/EP2814049A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/94—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected solely due to the pressure caused by the arc itself or by an auxiliary arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/94—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected solely due to the pressure caused by the arc itself or by an auxiliary arc
    • H01H33/95—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected solely due to the pressure caused by the arc itself or by an auxiliary arc the arc-extinguishing fluid being air or gas

Definitions

  • Embodiments of the present disclosure relate to a drive mechanism for a switching device, in particular for a circuit breaker. Further, embodiments of the present disclosure relate to a switching device comprising a drive mechanism described herein. Additionally, a use of the drive mechanism for operating a switching device, and methods for operating a drive mechanism and for operating a switching device by operating the drive mechanism are described herein.
  • Switches having a short response time are needed for many applications, e.g. circuit breakers, interrupters or disconnectors for low, medium and high voltage.
  • Such switches are driven by a drive mechanism for separating contact elements.
  • Conventional drive mechanisms for switches are spring drives, electromagnetic drives, motor drives, and pneumatic or hydraulic drives.
  • conventional drive mechanisms are difficult to adapt for ultra-fast applications in which short switching times are desired, e.g. for fault-current interruption by a circuit breaker.
  • a drive mechanism for switches with which the required short switching times can be achieved.
  • a drive mechanism is needed with which actuation of heavy-weight contact elements at distances of several cm within short periods of time can be realized, typically within less than 10 ms from a tripping command or signal.
  • a drive mechanism for a switching device that overcomes at least some of the problems in the art.
  • This object is achieved at least to some extent by a drive mechanism for a switching device, a switching device comprising drive mechanism described herein, a use of a drive mechanism as described herein for operating a switching device, a method for operating a drive mechanism for a switching device and a method for operating a switching device by operating a drive mechanism described herein according to the independent claims.
  • a drive mechanism for a switching device in particular for a circuit breaker, wherein the drive mechanism comprises an insulating tube delimiting an arcing chamber having a first end and a second end, wherein a first arcing element and a second arcing element are arranged in the arcing chamber.
  • the first arcing element is movable along a longitudinal axis of the arcing chamber.
  • the first arcing element and the second arcing element have mutually opposing surfaces configured for carrying an arc therebetween, an arc-generated pressure causing the first arcing element to move along the longitudinal axis away from the second arcing element and towards the first end of the arcing chamber.
  • a switching device comprising a drive mechanism described herein.
  • the switching device further comprises two contact elements for closing and opening the switch.
  • the first arcing element is coupled to at least one of the two contact elements for driving the at least one of the two contact elements such that the two contact elements connect or disconnect.
  • a method for operating a drive mechanism for a switching device comprises: inducing an arc between a first arcing element and a second arcing element; generating a pressure between mutually opposing surfaces of the first arcing element and the second arcing element by the arc; and causing the first arcing element to move along the longitudinal axis towards the first end of the arcing chamber due to the pressure, and optionally causing the second arcing element to move along the longitudinal axis towards the second end of the arcing chamber due to the pressure.
  • a method for operating a switching device comprises operating the drive mechanism as disclosed herein and at least one of closing or opening the switching device by driving at least one of the two contact elements of the switching device by at least one of the first arcing element and the second arcing element of the drive mechanism.
  • the drive mechanism is used for a switching device, in particular for a circuit breaker.
  • the drive mechanism comprises an insulating tube delimiting an arcing chamber which has a first end and a second end.
  • a first arcing element and a second arcing element are arranged, and the first arcing element is movable along a longitudinal axis of the arcing chamber.
  • the first arcing element and the second arcing element have mutually opposing surfaces configured for carrying an arc therebetween.
  • the arc causes the first arcing element to move along the longitudinal axis away from the second arcing element and towards the first end of the arcing chamber.
  • the term "arcing element” is to be understood as a substantially conductive element which is adapted for carrying an arc, more specifically is adapted for carrying the arc's foot.
  • materials of the arc-carrying surface of the arcing element are arc-resistant, such as copper tungsten (CuW).
  • the arc is an ablation-controlled arc.
  • the arc extends between mutually opposing surfaces of the two arcing elements.
  • “mutually opposing” is defined as facing each other in such a manner that an arc is sustained between the arcing elements, at least in some positions of the arcing elements.
  • the mutually opposing surfaces may be essentially flat and/or may extend along a plane perpendicular to the axis.
  • the mutually opposing surfaces may comprise topological features such as peaks for enhancing arc formation.
  • the arc ignited between the opposing surfaces of the first and the second arcing elements is used for generating electrothermal propulsion.
  • the electrothermal propulsion causing the first arcing element to move is based on a pressure generation between opposing surfaces of the first arcing element and the second arcing element due to a sudden gas expansion by heating of the gas therebetween.
  • the arc may carry an arcing current of 5 kA to 30 kA in amplitude and/or for a duration of at least 0.1 ms or at least 1 ms and/or at most 10 ms. The arc is extinguished when the electrical source no longer provides sufficient current and/or voltage.
  • a drive mechanism based on the principle of electrothermal propulsion is provided.
  • a drive mechanism is provided which is suitable for high-speed switching applications with fast actuation (i.e. opening or closing or in other words disconnecting or connecting) of switching contact elements.
  • the drive mechanism is capable of actuating switching contact elements at distances of several cm within very short periods of less than 10 ms. Thereby, high accelerations of the switching contact elements are achieved.
  • the term "contact elements” is to be understood as the elements of a switch which contact each other for establishing an electrical connection when the switch is closed, and which are separated from each other for interrupting or disconnecting the electrical connection when the switch is opened.
  • the drive mechanism is used for a circuit breaker, in particular for a medium voltage or (especially) a high voltage circuit breaker used for example in AC and DC applications.
  • the insulating tube delimiting the arcing chamber comprises a non-conducting material, such as non-conducting plastic material, PTFE, a ceramic, a resin or composite material, possibly fiber reinforced.
  • a non-conducting material such as non-conducting plastic material, PTFE, a ceramic, a resin or composite material, possibly fiber reinforced.
  • the term "insulating tube” is to be understood as a substantially non-conducting tube.
  • an insulating tube as described herein is made of a material having substantially no electrical conductivity.
  • the insulating tube may be coated or may be attached to conducting material such as a metal sheet or high strength steel rods.
  • the first arcing element is configured as a piston comprising a piston head and a piston shaft.
  • the piston head essentially (i.e by at least 80%, particularly by at least 90%, more particularly by at least 99%) fills the entire lateral (i.e. orthogonal to the axis) cross-sectional area of the arcing chamber.
  • the piston head presents an efficient surface to be pushed by the pressurized gas in the arcing chamber.
  • the piston head may even be in contact with the inner surface of the arcing chamber and/or even form an essentially gas-tight contact with the inner surface of the arcing chamber.
  • the piston head forms contact with the inner surface of the arcing chamber, which is configured for guiding a movement of the first arcing element towards the first end of the arcing chamber along the longitudinal axis.
  • the interfacial surfaces of the piston head and the arcing chamber have low surface roughness such that the piston head can slide along the inner surface of the arcing chamber.
  • the first arcing element in particular the piston shaft, can be slidingly mounted for guiding a sliding movement of the first arcing element towards the first end of the arcing chamber along the longitudinal axis.
  • interfacial sliding surfaces between the enclosure of the arcing chamber (e.g. the first end of the arcing chamber) and the first arcing element, particularly its piston shaft have low surface roughness as may be present in friction bearings.
  • the first arcing element, in particular the piston shaft may be supported by a sliding bearing.
  • the arc energy can substantially be converted into kinetic energy of the first arcing element with substantially no friction loss.
  • the first and/or second arcing element(s) may also have a different shape and configuration.
  • the first and/or second arcing element(s) may be configured without piston heads, but instead e.g. as cylindrical rods.
  • a first sliding contact is arranged at the first end of the arcing chamber.
  • the term "sliding contact” is to be understood as a contact with which an electrical contact can be established with a movable element, such as an arcing element as described herein.
  • the first sliding contact is configured for transmitting an electrical current to the first arcing element.
  • the first sliding contact may be configured for transmitting an arcing current, e.g. at least one electrical current pulse of 5 kA up to 30 kA in amplitude and of durations ranging from 0.1 ms to 10 ms, to the first arcing element during a total application time period ranging from 0.1 ms to 10 ms.
  • the first sliding contact can be configured for guiding a movement of the first arcing element towards the first end of the arcing chamber along the longitudinal axis.
  • the first sliding contact may have properties of the sliding mount described herein, and/or may be integrated in the sliding mount.
  • the interfacial sliding surfaces of the sliding contact and the portion of the first arcing element have low surface roughness as is useful for friction bearings.
  • the sliding contact for transmitting an electrical current to the first arcing element comprises multiple contact fingers for establishing an electrical contact with the arcing element, e.g. its piston shaft.
  • the sliding contact may be silver-plated.
  • the drive mechanism is provided with exhaust holes for relieving pressure from the inside of the arcing chamber, especially after the first arcing element has reached its desired displacement.
  • the exhaust holes can for example be provided at the first end of the arcing chamber and can provide a passage to an outside of the arcing chamber.
  • the exhaust holes are arranged in a first end cap provided at the first end of the arcing chamber.
  • the exhaust holes extend in an inclined direction with respect to the longitudinal axis of the arcing chamber.
  • the exhaust holes are dimensioned to ensure that as soon as the first arcing element reaches its desired position, the remaining arc-generated pressure is released from the arcing chamber.
  • the exhaust holes may also be arranged for reducing a pressure buildup resulting from a compression of the gas volume between the first end of the arcing chamber and the first arcing element due to the movement of the first arcing element towards the first end of the arcing chamber (and optionally likewise with the second end and the second arcing element). This aspect is particularly useful, if the first and/or the second arcing element is shaped as a piston.
  • the exhaust holes are dimensioned for quickly relieving the pressure as soon as the first arcing element reaches its desired displacement.
  • the first end of the arcing chamber comprises a first end cap and the second end of the arcing chamber comprises a second end cap.
  • the first end cap and the second end cap can be fixedly connected with respective ends of the insulating tube, e.g. by clamp coupling, screw coupling or bolted fastening.
  • the first end cap and/or the second end cap are made of insulating material, e.g. non-conducting plastic material or some other material mentioned above for the insulating tube.
  • first end cap and the second end cap are connected via tensile rods arranged outside of the arcing chamber or outside the insulating tube.
  • the tensile rods preferably extend in the axial direction and are preferably used in order to fix the first end cap and the second end cap to each other and/or to axially fasten the drive mechanism.
  • the drive mechanism described herein further comprises a first damping element arranged and configured for damping a movement of the first arcing element.
  • the first damping element may be used for damping the movement of the first arcing element before, preferably just before, reaching the first end of the arcing chamber.
  • the first damping element is positioned at a transition portion between the first end cap and the first end portion of the arcing chamber, preferably at a position at which the first arcing element has reached its desired displacement.
  • the first damping element may be positioned outside the arcing chamber, e.g. coupled to the first arcing element's piston shaft.
  • the first damping element may be an oil damping element or any other damping element useful in the art.
  • the first arcing element and the second arcing element are both movable along a longitudinal axis of the arcing chamber.
  • the arc-generated pressure between the arcing elements causes them to move along the longitudinal axis away from each other.
  • the arc causes the first arcing element to move towards the first end of the arcing chamber and the second arcing element to move towards the second end of the arcing chamber.
  • both arcing elements i.e.
  • the first arcing element and the second arcing element are movable along a longitudinal axis of the arcing chamber the arc ignited between opposing surfaces of the first arcing element and the second arcing element is used for generating electrothermal propulsion.
  • the first arcing element and the second arcing element are equal in weight.
  • a drive mechanism is provided with which a recoil force acting on the drive mechanism can substantially be avoided, because in this case opposite momenta of equal magnitude are transferred to the first arcing element and the second arcing element.
  • the first arcing element and the second arcing element are configured symmetrically with respect to a plane oriented perpendicular to the longitudinal axis of the arcing chamber.
  • the entire drive mechanism (possibly but not necessarily even including the gears) is configured essentially symmetrically with respect to a plane being perpendicular to the longitudinal axis of the arcing chamber.
  • a drive mechanism with increased efficiency is provided, since the first arcing element and the second arcing element are accelerated into opposing directions due to the arc-generated pressure; furthermore both motions of the arcing element can be used for opening or closing contact elements of a switching device.
  • a drive mechanism can be provided in which substantially no recoil force acts on the drive mechanism during its operation.
  • any feature described herein for the first arcing element is also applicable to the second arcing element, either together with the first arcing element or alone.
  • the features, the arrangement and/or the configuration of the second arcing element may substantially correspond to the features, the arrangement and/or the configuration of the first arcing element, respectively, as described above.
  • the second arcing element may also be configured as a piston comprising a piston head and a piston shaft.
  • the drive mechanism further comprises a second sliding contact arranged at the second end of the arcing chamber.
  • the second sliding contact is configured for transmitting an electrical current to the second arcing element.
  • the features, the arrangement and the configuration of the second sliding contact substantially correspond to the features, the arrangement and the configuration of the first sliding contact described above, with the difference that the second sliding contact is associated with the second arcing element.
  • the description of the first sliding contact also applies to the second sliding contact but in relation to the second arcing element instead of the first arcing element.
  • the drive mechanism is provided with exhaust holes for relieving pressure from the inside of the arcing chamber, after the second arcing element has reached its desired displacement.
  • the exhaust holes are provided at the second end of the arcing chamber.
  • the exhaust holes are arranged in the second end cap provided at the second end of the arcing chamber.
  • the features as well as the arrangement and/or configuration of the exhaust holes provided at the second end of the arcing chamber substantially correspond to the features, the arrangement and/or the configuration of the exhaust holes provided at the first end of the arcing chamber, respectively, as described above.
  • the drive mechanism described herein further can comprise a second damping element arranged and configured for damping a movement of the second arcing element.
  • the features, the arrangement and/or the configuration of the second damping element substantially correspond to the features, the arrangement and/or the configuration of the first damping element, respectively, as described above.
  • a drive mechanism 10 for a switching device 50 in particular for a circuit breaker, according to embodiments described herein comprises an insulating tube 14 delimiting an arcing chamber 11 having a first end and a second end.
  • the insulating tube 14 is surrounded by a metallic sleeve 15.
  • a first arcing element 12 and a second arcing element 13 are arranged in the arcing chamber 11.
  • the first arcing element 12 and/or the second arcing element 13 are movable along a longitudinal axis 30 of the arcing chamber 11.
  • the first arcing element 12 and the second arcing element 13 have mutually opposing surfaces configured for carrying an arc therebetween.
  • the arc is induced by applying an arcing voltage and/or arc current between the first arcing element 12 and the second arcing element 13 being in proximity to each other.
  • the arc causes the first arcing element 12 to move towards the first end of the arcing chamber 11 along the longitudinal axis 30 and the second arcing element 13 to move towards the second end of the arcing chamber 11 along the longitudinal axis 30.
  • the arc ignited between the opposing surfaces of the first arcing element 12 and the second arcing element 13 is used for generating electrothermal propulsion.
  • the electrothermal propulsion causing the first arcing element 12 and the second arcing element 13 to move is based on a pressure generation between opposing surfaces of the first arcing element 12 and the second arcing element 13 due to the arc-induced expansion of the gas therebetween.
  • the first arcing element 12 and the second arcing element 13 are configured as pistons each comprising a piston head 121, 131 and a piston shaft 122, 132.
  • the piston heads 121, 131 present mutually opposing surfaces directed to each other for carrying the arc therebetween. These surfaces are almost filling the entire arc chamber cross-section, so that the pistons are efficiently pushed away from each other by the pressure generated due to the arc.
  • the piston heads 121, 131 are slidable along the inner surface of the arcing chamber 11.
  • the inner surface of the arcing chamber 11 is configured for guiding the movement of the first arcing element 12 towards the first end of the arcing chamber 11 along the longitudinal axis 30 as well as the movement of the second arcing element 13 towards the second end of the arcing chamber 11 along the longitudinal axis 30.
  • the interfacial surfaces of the piston heads 121, 131 and the arcing chamber 11, particularly the inner surface of the insulating tube 14, have low surface roughnesses.
  • a first sliding contact 231 arranged at the first end of the arcing chamber 11 and a second sliding contact 232 arranged at the second end of the arcing chamber 11 are proved. Further, the first sliding contact 231 and the second sliding contact 232 are typically configured for guiding the movement of the first arcing element 12 and the second arcing element 13 along the longitudinal axis 30.
  • the first end of the arcing chamber 11 comprises a first end cap 21 and the second end of the arcing chamber 11 comprises a second end cap 22.
  • the first and second end caps 21, 22 are fixedly connected to respective ends of the insulating tube 14.
  • Fig. 2 shows a cross-sectional view of an exemplary embodiment of the drive mechanism 10 which can be combined with other embodiments described herein.
  • the description of Fig. 1 also applies to Fig. 2 .
  • the first end cap 21 and the second end cap 22 are connected to each other via tensile rods 41 arranged outside of the arcing chamber 11.
  • the tensile rods 41 are typically used in order to fix the first end cap 21 and the second end cap 22 to each other.
  • the tensile rods 41 are employed to axially fasten the drive mechanism 10.
  • the first and second sliding contacts 231, 232 shown in Fig. 2 and related items are described in more detail.
  • the first and second end caps 21, 22 are provided with electrical interface elements 25 for transmitting an electrical current to the first and second arcing elements 12, 13 via the first and second sliding contacts 231, 232.
  • an electrical voltage is applied between the two electrical interface elements 25 (on the lefthand side and on the right-hand side).
  • the arc ignites and an arcing current flows from the electrical interface elements 25 associated with the first arcing element 12 over the sliding contact 231 to the first arcing element 12, then via the arc to the second arcing element 13, then via the sliding contact 232 to the electrical interface elements 25 associated with the second arcing element 13.
  • the arc and the electrothermal propulsion described above are initiated.
  • Fig. 3 a perspective view of a drive mechanism according to an exemplary embodiment similar to that of Fig. 2 is shown.
  • the description of Figs. 1 and 2 also applies to Fig. 3 .
  • the first and second end caps 21, 22 can be provided with exhaust holes 40.
  • the exhaust holes 40 extend from the inside of the arcing chamber (at or near a respective end thereof) to the outside of its enclosure.
  • the exhaust holes 40 may be arranged in contact with or through the end caps 21, 22.
  • the exhaust holes 40 are employed for relieving pressure inside the arcing chamber 11, which increases due to gas expansion inside the arcing chamber 11 as a result of the electrothermal propulsion.
  • Figs. 1-3 show a drive mechanism 10 with both arcing elements 12, 13 being movable. According to a variation, only the first arcing element 12 is movable, and the second arcing element 13 is fixed. In this case the second arcing element 13 can be fixed to the arcing chamber enclosure, and sliding contacts and the like are not necessary for the second arcing element 13.
  • FIGS. 4 and 5 illustrate the use of the drive mechanism 10 for operating a switching device 50, more particularly a high voltage circuit breaker 50.
  • Figs. 4 and 5 show the switching device 50 comprising the drive mechanism 10 described herein, and further comprising two contact elements 51, 52 for closing and opening the switching device 50.
  • Fig. 4 shows a cross-sectional view of the switching device 50 in a closed state
  • Fig. 5 shows a cross-sectional view of the switching device 50 in an open state.
  • the first contact element 51 of the switching device 50 is movable along a switching axis.
  • a gear system G can couple the first arcing element 12 to the first contact element 51 of the switching device.
  • the gear system G translates the movement of the first arcing element 12 caused by the arc into a movement of the first contact element 51 for opening the switching device 50.
  • the gear G may be any gear used for coupling a driving mechanism, e.g. a spring drive, to a switching device such as a circuit breaker.
  • the gear may, for example, by realized as a lever-type gear.
  • the switch axis is parallel to the axis of the drive mechanism, and the gear G translates a motion of the first arcing element 12 into an opposite movement of the first contact element 51. While in principle any angle can be chosen between the switch axis and the axis of the drive mechanism, the parallel orientation allows for a particularly simple and effective transmission of motion by the gear G.
  • first arcing element 12 may be used in any known manner for driving the switching device 50.
  • the switching device 50 is a double-motion switch or switching device 50, and both contact elements 51, 52 may be driven by the first arcing element 12 to move in opposite directions via any known gear (e.g. via a lever gear).
  • the switching device 50 is a double-motion switch, i.e. both contact elements 51, 52 are movable, and the first contact element 51 is coupled by a first gear to the first arcing element 12, and the second contact element 52 is coupled by a second gear to the second arcing element 13 (not shown).
  • This embodiment allows a particularly advantageous reduction of recoil forces.
  • the first and second arcing elements 12, 13 are jointly coupled via a common gear such that motion of either arcing element 12 or 13 and/or of both arcing elements 12, 13 combined drives the switching device 50, in any known manner (e.g. any coupling of the first arcing element 12 to the switching device 50 described above may be used for the pair of arcing elements 12, 13 coupled by a gear using both motions in opposite directions.
  • any coupling of the first arcing element 12 to the switching device 50 described above may be used for the pair of arcing elements 12, 13 coupled by a gear using both motions in opposite directions.
  • additional couplings or gears may couple to one or both arcing elements 12, 13 for moving additional parts of the switching device 50, e.g. nominal contacts.
  • At least the first arcing element 12 is coupled to at least one of the two contact elements 51, 52. Thereby, by a movement of at least one of the arcing elements 12, 13 at least one of the two contact elements 51, 52 is driven such that an electrical contact between the two contact elements 51, 52 is established or interrupted.
  • the switching time for closing or opening the switching device 50 i.e. for establishing or interrupting an electrical contact, is ranging from 1 ms to 10 ms from a tripping command or a tripping signal.
  • a method for operating a drive mechanism 10 for a switching device 50 in particular for a circuit breaker 50, is provided.
  • the method for operating a drive mechanism 10 comprises: inducing 101 an arc between a first arcing element 12 and a second arcing element 13; generating 102 a pressure between mutually opposing surfaces of the first arcing element 12 and the second arcing element 13 by the arc; and causing 103 the first arcing element 12 to move towards the first end of the arcing chamber 11 along the longitudinal axis 30 due to the pressure generated by the arc.
  • the method further includes causing the second arcing element 13 to move towards the second end of the arcing chamber 11 along the longitudinal axis 30 due to the pressure generated by the arc, or alternatively by another arc. Any aspect described herein for the motion of the second arcing element 13 also applies to this method.
  • the step of inducing 101 the arc includes applying at least one current pulse of 5 kA to 30 kA in amplitude and durations of 0.1 ms to 10 ms, for a period of time from 0.1ms to 10 ms to the first arcing element 12 and/or to the second arcing element 13.
  • applying the at least one current pulse includes delivering the at least one pulse from a pre-charged capacitor.
  • the at least one current pulse is provided by a fault current, in particular by the fault current which shall be interrupted by the switching device 50 in case of a fault.
  • a method for operating a switching device 50 comprises (i) operating 201 the drive mechanism 10 as disclosed herein and at least one of (ii) closing 202 or (iii) opening 203 the switching device 50 by driving 204 at least one of the two contact elements 51, 52 by at least one of the first arcing element 12 and the second arcing element 13.
  • Embodiments of the method for operating a switching device 50 include operating the switching device 50 via a gear system G coupled to at least one of the two contact elements 51, 52 and to at least the first arcing element 12 (and optionally also to the second arcing element 13) of the drive mechanism 10.
  • a gear system G coupled to at least one of the two contact elements 51, 52 and to at least the first arcing element 12 (and optionally also to the second arcing element 13) of the drive mechanism 10.
  • any of the couplings between arcing element(s) 12, 13 and contact element(s) 51, 52 described and/or illustrated in conjunction with Figs. 4 and 5 above may be realized.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
EP13171532.8A 2013-06-11 2013-06-11 Antriebsmechanismus für eine Schaltvorrichtung Withdrawn EP2814049A1 (de)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114336508A (zh) * 2022-03-08 2022-04-12 武汉精熔潮电气科技有限公司 一种基于电弧做功的电路保护方法及装置

Citations (3)

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DE2358368A1 (de) * 1973-11-05 1975-05-15 Bbc Brown Boveri & Cie Lichtbogenloescheinrichtung fuer strombegrenzende elektrische schalter
CH566640A5 (de) * 1973-11-12 1975-09-15 Bbc Brown Boveri & Cie
EP0025918A1 (de) * 1979-09-17 1981-04-01 Siemens Aktiengesellschaft Strombegrenzer

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
DE2358368A1 (de) * 1973-11-05 1975-05-15 Bbc Brown Boveri & Cie Lichtbogenloescheinrichtung fuer strombegrenzende elektrische schalter
CH566640A5 (de) * 1973-11-12 1975-09-15 Bbc Brown Boveri & Cie
EP0025918A1 (de) * 1979-09-17 1981-04-01 Siemens Aktiengesellschaft Strombegrenzer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114336508A (zh) * 2022-03-08 2022-04-12 武汉精熔潮电气科技有限公司 一种基于电弧做功的电路保护方法及装置

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